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UT Research Study Shows That Hand Washing of
Cars at Home is Harmful to Automobile Finishes


Posted 4-13-13

Hand wash jobs are extremely harmful to automobile finishes.
Tests conducted by the University of Texas to compare surface disturbances showed that a single home hand wash on an automobile can produce scratches that penetrate as deep as 1/10 of the total thickness of the automobile's
paint.


These test findings at the University of Texas substantiated tests done over
ten years ago by the Technical University of Munich, Germany, in association
with Mercedes-Benz, which at that time showed that similar damage was done to an
automobile when using detergent, low water volume commonly found in hose nozzles at home, buckets of water, sponges and towels used in the average home car 
washing.


Specific scientific tests at the University of Texas further showed that hand
car washing can produce so many marks on a car's finish that they cannot even be
counted. The tests showed that in all hand washing temperatures, surface
reflectance readings steadily declined, with some hand washing techniques being
considerably worse than others. By contrast, when cars were washed by
professional full service car washes, there was virtually no change in the
surface reflectance or shine readings.


The tests showed that the average backyard hose is not able to supply enough
water along with the detergent action to avoid damaging the car's finish. The  
most harmful method of washing cars was found to be the special "car wash"  
brushes that hook on to a garden hose and are purchased from local hardware  
stores or automotive supply dealers. The use of this type of brush with the low 
water pressure that comes out of the garden hose is the most destructive on
the finish of an automobile. The tests also showed that techniques used at  
professional car washes are virtually harmless to automobile finishes.

Findings from the University of Texas research study indicate that with the 
large amounts of water and specialized detergents used in professional car 
washes, sophisticated gloss and reflectance meter readings from new finishes  
used on automobiles were virtually the same before and after the equivalent
of several months of normal washings in a professional car wash.


The professional car wash is able to provide and use tremendous amounts of
water along with specialized detergents and appropriate mechanical action from
cloth pads and curtains which the backyard hose and bucket hand car wash is not
able to supply.  This important and interesting research study performed by the
University of Texas found that today's automobile owner is much wiser to have
their car washed by a professional car wash, rather than washing it at home in  
their own backyard.

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